林龄、采伐方式对大叶相思萌芽更新的影响

Effects of Tfree Age,Felling system on the sprout Regeneration of Acacia auriculitormis

在海南省琼海县进行了不同林龄、不同采伐方式对大叶相思萌芽更新影响的研究，同时比较了保留不同萌条数量的萌芽林生长表现，结果表明：（１）林龄对伐桩萌芽率没有显著影响，但对伐桩存活率及萌条的径、高生长影响显著或极显著。林龄越大，萌芽更新效果越差；（２）皆伐和隔行采伐对大叶相思伐桩的萌芽率、萌条数量和存活率均无显著影响，但对萌条的径、高生长影响极显著。试验证明对大叶相思林分施以隔行采伐通过萌芽更新建立复层林分是可行的；（３）保留不同数量萌条对萌芽林早期（１．５年生）的径、高生长有极显著影响，但对后期（４．５年生）的生长影响不显著。每棵植株伐桩保留４根萌条的萌芽林生物产量最高，更新效果最好。

Three studies were conducted to look at the effects of tree age,felling systemand number of reserved sprout on the sprout regeneration of Acacia auricullformis in Qiong-hai county, Hainan Province.(1) Five plantations with the ages of 20,36, 48,60 and 72months were cut at 60 cm stump height.Sprouting was most vigorous and consistent inyoung stands aging from 20 to 48 months. (2)Two felling systems(clear felling and fellingwith 50% trees removed)were involved in the coppicing experiment. There were no signifi-cant differences in stumps survival rate and number of coppice shoots produced per plant.(3)Comparison was made for the growth performance and biomass yield of three sproutingforests with 2,4 and all the sprouts per stump/plant reserved respectively. Results showedthat the number of reserved sprouts had significant effects on the growth of diameter andheight of 1 5 years old sprouting forests,but not on that of 4.5 years old.To maximize thebiomass production,a thinning to the sprouts at about 6 months after cutting with 4 reservedsprouts per stump/plant is recommended.